When the first visitors were reaching Yellowstone the West Thumb Geyser Basin was much more active than it is today. Since then it has cooled, the few active geysers are more sporadic, and many of the pools have changed color.
Copyright: G. Donald Bain Type: Spherical Resolution: 4000x2000 Taken: 31/07/2014 Chargée: 22/10/2014 Published: 10/03/2015 Affichages ::
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